Legion, based on the Marvel Comics by Chris Claremont and Bill Sienkiewicz, is the story of David Haller (Dan Stevens), a troubled young man who may be more than human. Diagnosed as schizophrenic as a child, David has been in and out of psychiatric hospitals for years. Now in his early 20's and free once again, David loses himself in the rhythm of the structured regimen of daily life: breakfast, lunch, dinner, therapy, medications, sleep. David spends the rest of his time in companionable…